html{font-size: 20px;}
*{margin: 0;padding: 0;}
@media screen and (min-width:640px ) {
    .main{
        background-color: #f1f1f1;
    }
    body{
        background-color: #fff;
    }
}
body{background-color: #f1f1f1;  height: 100%;}
.main{background-color: #f1f1f1}
.demo{
    position: relative;
    padding: 0.6rem 0.5rem 0.75rem 0.6rem;
    width: 14.9rem;
    height: 1.1rem;
    border-bottom: 1px solid #dbdbdb;
    background-color: #fff;
    overflow: hidden;
}
.demo span{
    display: block;
    position: absolute;
    height: 1.1rem;
    line-height: 1.2rem;
    left: 0.6rem;
    top: 0.5rem;
    font-size: 0.7rem;
    font-weight: 400;
    color: #ccc;
}
.demo img{
    position: absolute;
    height: 0.75rem;
    top: 0.7rem;
    right: 0.55rem;
}
.demo select{
    display: block;
    position: relative;
    z-index: 9;
    filter:alpha(opacity=0); /*IE滤镜，透明度50%*/
    -moz-opacity:0; /*Firefox私有，透明度50%*/
    opacity:0;/*其他，透明度50%*/
}
.option{font-size: 0.7rem;
    font-weight: 500; color: #ccc;}
.area{
    padding: 1rem 0.5rem 0.5rem 0.5rem;
    border-bottom: 1px solid #dbdbdb;
    background-color: #fff;
    margin-bottom: 2rem;
}
.area textarea{
    width: 15rem;
    height: 3.6rem;
    border: none;
    resize : none;
}
.foot{
    margin-bottom: 2rem;
    width: 16rem;
    text-align: center;
    height: 2.25rem;
    line-height: 2.35rem;
    background-color: #df4242;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 500;
}